Circuit system in a package

摘要

A circuit packaging system allows a combination of integrated circuit dice and surface mount electronic components to be mounted on a printed circuit board which is in turn mounted on a lead frame and encapsulated, thus providing an environmentally sealed package which is manufactured using standard circuit fabrication methods and machinery.

主权项

1. A circuit packaging system comprising:
a printed circuit board having a planar insulating body composed of a high frequency glass reinforced hydrocarbon/ceramic laminate; said planar body including a first surface and a second surface, wherein at least said first surface is at least partially coated with conductive metal; said conductive metal being a copper alloy coated with a gold alloy; said conductive metal being formed into a pattern of pads and circuit traces; at least one surface mount electronic component conductively attached to a first portion of said pattern of pads; at least one integrated circuit attached to said first surface with a thermally and electrically conductive adhesive and wirebonded to a second portion of said pattern of pads; a metal lead frame composed at least in part of a copper alloy and having a top surface, a bottom surface, and side edges, said second surface of said printed circuit board being attached with a thermally and electrically conductive adhesive to a portion of said metal lead frame top surface; a third portion of said pattern of pads being wirebonded to said lead frame; and, a molded encapsulant consisting of plastic molding compound enclosing said printed circuit board, said electronic component and said integrated circuit, said wirebonds and said metal lead frame with the exception of said bottom surface and at least portions of said side edges, thereby providing an encapsulated circuit wherein the exposed surfaces of said lead frame provides conductive connections to said circuit.